Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a409a42eec0ab47…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 20:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 119e5c1c86dd233a50f07eccd86640bf SHA-1: 07cff55658a81f343ce958d6c1066d15c20c4309 SHA-256: 6a409a42eec0ab475a01ee086921a39086973a16730cb632f67278f00334c4c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using link farms for malicious purposes. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nbmounts.com/userfiles/file/1631096812.pdf In PDF document text
    • https://digireg.sk/upload/31263230407.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b74c83546b9ff9229946723c49eb91c7/15342637885.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/75144766668.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/97124507814.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/sovijaberekadejub.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/nodoj.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/25016140555.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/zisoroweto.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/tosetixel.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/guzilo.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/11751780003.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/vijarirugopoga.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/95654590125.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/82074447458.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/79c974d5331dabaf96da5540afb0cc35/gakuwegu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138762d89e64---tovaruwetedatipobozof.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/fiwujigadujape.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17260238218.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/bupeligejenodutif.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/saxulo.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fegugigomepekafad.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb5fa9656---52114141591.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/37218924012.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/00tl9gembtco5lq8gsnkveutaa/37865071751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=xmeye+android+user+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 10532 bytes
SHA-256: 041b38432303d00db9fd22ebf19de8377756eb2fad2b7675c4a7ef69c9d58727
font_01_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 17772 bytes
SHA-256: 33532b9f82432faa81fbb6d3ff0b695c2244d8ca77981407d14abac52fe1b160
font_02_sfnt_off000131e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1